A New Design of Float-Type Variable Area Flowmeter

概要

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A new type of float-type variable area flowmeter (rotameter)using a straight outside tube and a tapered internal rod is invented and tested. The flow equation is determined with the aid of momentum theory. Fundamental considerations relating to design and production are also given. Results of trial manufacture and experiments for the newly designed rotameter showed very good stability of float. The discharge coefficient was fairly constant in a wide range of Reynolds numbers (up 50) and with variation of floats. This fact indicates that viscosity variation of fluid has little influence on flow measurement by this rotameter. The production of this rotameter is far easier than that of the conventional tapered tube rotameter. This rotameter is advantageous in that it can easily be produced with an appropriate measuring scale.
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